Tank car



May 29, 1928.

G. E. TILE'IY TANK CAR Filed March 26, 1925 mwsuron GEORGE f. 771. 5r [Rf WITNESS l TmRNEYS Patented May 29, 1928.

unrran [STATES GEORGE E. TILEY, OF COMPANY,

nrcnmonn HILL, NEW YORK, on NEW YORK, N. Y.,

ASSIGNOE TO GENERAL CHEMICAL A CORPORATION OF NEW YORK.

TANK CAB.

Application filed This invention relates to railway tank cars and particularly to that type thereof which is used for the transportation of certain acids, especially sulphuric acid. Sulphuric acid, for example, is usually prepared and shipped in concentrated condition and in large quantities for industrial purposes. When in its concentrated condition, the acid does not react with or corrode the steel employed for the tank car construction, but when dilute condition, it -will attack the steel and rapidly destroy the same. In spite of the fact that the acid is always shipped in concentrated condition in tank cars, it has been found that dilute acid solutions are formed in the dome of the cars and in the upper portions of the tanks adjacent thereto. The formation of the corroding, dilute acid solutions is probably due to the presence of moisture in the air inthe dome. At any rate, the water vapor condenses on the inside walls of the dome and forms drops of dilute acid solution. These drops trickledown along the inside wall of the dome, some collecting about the connecting joint of the dome to the main body portion of the tank, and some following the inside wall of the upper part of the tank to points some distance below the connect--- ing joints. Serious corrosion of the tank metal is thus manifested, not only in the dome and the joint thereof to the tank, but also in the upper tank sheets. If the corrosion were limited to the metal of the dome, it would be necessary only to replace or renew the dome from time to time, but as the upper sheets of the tank are also attacked and as the replacement of such sheets is more difficult and costly, the corrosion thereof becomes highly objectionable. H

' The roblem of preventing corrosion is further complicated by the requirements and specifications of the railway associations for tank cars used or acids. Because of these requirements, the size of the opening permitted to be cut in the shell of the tank is restricted to comparatively small dimensions relatively to the size of the. dome unless such openings are specially reinforced.-

opening is employed, the top sheets of the tank adjacent to the openingform a shelf u n which the dilute i the openm solutions collect, while arged and its edges are ise the number of joints 1n wh1c reinforced,

the transportation of- If the small, un-reinforced- March 26, 1925. Serial No. 18,351.

the acid may be injuriouslv effective is in creased. Both of these types of construction are unsatisfactory.

It is the principal object tion to provide a new and improved construction for not only preventing this corrosion of the tank sheets but also for reinforcng the top sheets adjacent to the dome open- 1ng. The construction according to the invention is such that the means for preventmg the corrosion also serves to reinforce the top sheets without increasing the number of oints in which the acid may collect, while at the same time, the reinforcement serves as a means for preventing the corrosion.

Other objects will be apparent to those skilled in the art to which this invention relates from a perusal of,,t-he following specitication and by reference to the accompanymg drawing forming a part hereof.- In said drawing, Fig. 1 is a, fragmentary, central, vertical section of a tank car illustrating a satisfactory example of a construction enibodymg my invention and Fig. 2 is a similar view of another constructional example.

The numeral 10 indicates the side walls of of this inventhe main portion of a tank car to the upper part of which is secured, as by the rivets 11, the dome 12. In the example shown in Fig. 1, a ring 13 of anysuitable metal is placed within the lower part of the dome 12 and is secured to the side walls thereof by the rivets 14. The lower edge of the ring extends downwardly, as indicated at 16, below the dome opening formed in the side walls 10, and forms a protective lining which covers the line of junction between the dome sheet and the side walls 10. The upper edge of the ring is preferably chamfered, as indicated at 17 and is calked inwardly into the dome sheet-at the edge of the chamfer, to prevent any drops of fluid which may collect upon the inner wall of the dome above the ring from flowing down between the dome sheet and ring. The 'oint formed between the inner edge of the ome opening in the side walls 10 of the tank and the ring 13 is preferably welded, as indicated at 18, to prevent any of the acid contents of the tank which splash upwardly from working in between the ring and dome sheet.

. In Fig. 2, tion of the ring 13 the downwardly projecting poris in the form of an anh nular flange 145 which contacts with the inner face of the side walls and is preferably conterminous with the flange 19 of the dome 12. By forming the ring with the flange as shown in Fig. 2, and extending the rivets 11 through the dome flange 19, the sidewalls, and the'flange 14, the resulting reinforcement due to the flange compensates for the weakening caused by cutting out the opening for the dome and produces a strong structure. The u per edge of the rin 13' is also chamfere as at 17 and calEed in the same manner as the ring shown in Fig. 1, while the outer edge of the flange 14 may either be calked or welded to the inner face of the top sheet, as indicated at 18 to prevent seepage ofthe acid between said flange and the top sheets of the tank.

In both forms of the invention illustrated,-

7 any fluid that may condense upon the inner walls of the dome will flow downwardly along the rings andwill drop therefrom into the main body of the acid from the lowermost the upper sheets of ring mounted within said and a dome secured ing, a combined reinforcing and protecting edges of the rings, thereby preventing any of the fluid from following or flowing along the side walls 10 of the tank. As the rings cover the connecting joints between 'thedome and tank, access of the dilute acid solutions to, and the collection thereof about, such joints is prevented. In addition to protecting the connecting joints and the upper sheets of the tank from corrosion, the rings, shown in both the illustrated examples, also serve to reinforce the u per sheetsof the tank and compensate or the weakening thereof due to the presence of the more desirable, larger dome opening.

I claim:

1. In a tank car having a dome opening and adome secured thereto about said opening, a combined reinforcing and protecting dome to cover the connection joint between said domeand tank andprojecting downwardly into said tank below theinner surface of the upper'sheets of said tank adjacent to said dome, whereby any liquid collectin upon the inner surface of the dome is cond the interior of the tank without contacting with theinner surface of the upper sheets of said tank. 4 v

2. In a tank car having a dome o ning thereto about sai opengagenient with and ness to conduct any ing' below. t

noted from the dome to.

my hand. Y

connecting joint between said dome and tank, said ring having an annular laterally projecting flange arranged in contacting enprojecting below the inner surface of the upper sheets of said tank, said flange being of suflicient thick- ,liq'uid collecting upon the inner surface of terior of the tank without contacting with the kinner surface of the upper sheets of said tan 4. In a tank car-having a dome opening,

a dome provided with an annular, laterally projecting, attaching flange surrounding said opening, a combined reinforcing and urotecting "ring mounted within said dome to cover the connecting joint between said dome and flange, with a laterally projecting flange arranged in contactingl engagement with and projectsaid flange being of sufficient thickness to conduct any liquid collecting upon the inner surface of said dome into the interior of the tank without contacting with the inner surface of the upper sheets of said tank, and securing means passing between both of (said dome from following the inner surfaces of the upper sheets of said tank.

In testimony whereof I have hereunto set enonen n. TILEY. a

said dome into the. inf said ring being provided e inner surface of thejupper sheets of said tank adjacent to said dome,

and means associated with said projecting downwardly into said 7 

